Echophenomenon (also known as echo phenomenon; from Ancient Greek ἠχώ (ēkhṓ) " echo, reflected sound") is "automatic imitative actions without explicit awareness" ^[1] or pathological repetitions of external stimuli or activities, actions, sounds, or phrases, indicative of an underlying disorder. ^{[2] [3]}

The echophenomena include repetition: ^[1]

• echolalia (syn. echophrasia) – of vocalizations (the most common of the echophenomena) ^[1]
  • echopalilalia – of words ^[4]
  • echothanatologia - of words centered on death, described in a review of grief in the context of neurodevelopmental disorders ^[5]
• echopraxia (syn. echokinesis, echomatism ^[4]) – of actions, movements
  • echothanatopraxia - of actions related to the cause of death ^[5]
• echopathy – of actions or speech ^[4]
• echoplasia – physically or mentally, tracing contours of objects ^{[1] [3]}
• echolalioplasia – involving sign language, described in one individual with Tourette syndrome (as of 2012 ^[update]). ^{[1] [6]}

References